Composition for discharge printing



Patented Oct. 22, 1946 UNITED STATES PATENT OFFICE 2,409,980 coMrosrrronFOR nIscnARoE PRINTING Edgar C. Jensen, Rocheste assignors to ester,

No Drawing. Application Serial No. 500,

r, Herbert G. Scull, New York, and James G. McNally, Eastman Kodak N.Y., a corporation of Rochester, N. Y., Company, Roch- Ncw J erscy August28, 1943, 410

9 Claims. (01. 8 64) witn cotton, viscose and cuprammonium rayon.

It is known in the art of textile printing that colored cellulosecarboxylic ester fabrics will not fined white, without the addition of aswelling agent and a suitable catalyst. It is also well out, or halo,when subjected to a prolonged or pressure steaming, suitable to destroyor permanently decolorize the dyed ground. It is also well known thatanthraquinone paste will speed up the action of the above reducingagents, Within a tion of the sulfoxylates in a anthraquinone paste.

salicylic acid or a salt of salicylic acid to accelerate the dischargingaction of the sulfoxylates. It is, accordingly, an object of ourinvention to provide a new method for discharge printing. A furtherobject of our invention is to provide a new composition for dischargeprinting. Other objects will become apparent hereinafter.

In accordance with our invention, we effect the discharge ofdischargeable colors on textile materials comprising cellulosecarboxylic esters with aldehyde metal sulfoxylates, in the presence ofsalicylic acid or a salt of salicylic acid. The discharge isadvantageously effected in the presence of a swelling agent, e, g.triethylene glycol, diacetylethanolamine, propylene glycol, diethyleneglycol, sodium thiocyanate, calcium thiocyanate,

zinc thiocyanate, potassium thiocyanate or thiodiglycol. In practicingour invention, it is advantageous to prepare a paste containingsalicylic acid or a salt of salicylic acid, the sulfoxylate, a swellingagent and a thickening agent. This paste composition is then printedupon the fabric with a dischargeable dye, and the printed fabricsubjected to the action of steam whereupon discharging takes place.

The following examples will serve to illustrate the manner of practicingour invention.

Example 1 A 100% cellulose acetate satin material was dyed a light brownwith 0.5% Eastone Blue BB, 0.5% Eastone Orange 2R, and 0.125% EastoneRed R in the customary single bath method of dyeing.

The above fabric after drying was printed with a paste made as follows:

Sodium formaldehyde sulfoxylate lbs 3 Water qts 1% Thiodiglycol qtsSupertex T-125 (solubilized gum karaya textile gum; Jacques Wolf andCompany) qts Salicylic acid oz 8 The above paste was applied by a rollerprinting machine; the fabric was dried, and aged for 3-6 minutes above212 F. in the usual manner Example 2 A fabric constructed of 50% rayonand 50% viscose rayon shadeusing 2% of Eastone Blue weight of celluloseacetate and cellulose acetate was dyed a blue BB based on the 1.6% ofPont- Potassium sulfoxylate formaldehyde lbs 1 /2 Thiodiglycol oz Waterqts 1% Supertex T- qts 2 A;

Salicylic acid oz 4 based on the v until foaming stopped. as octylalcohol may be added.)

of, sodium formaldehyde sulfoxylate was added.

' processed printed by the Example 3 A blue-dyed fabric like thatdescribed in Example 2 was printed by the roller printing method usingthe following formula:

Per cent Algol Orange RFA Suprafix (0.1. No. 1217) 20 Vat paste 80 Thevat paste was made up as follows: British gum lbs 2 7 Wheat starch lbs/2 Water qts 3 /2 boiled for hour, lbs. of sodium car- The above,ingredients were the heat turned off, and 1 j'bonate, /2 lb. ofsalicyclic acid, and 8 oz. of thic- Stirring was continued (Antifoamagents such Then 1 lbs.

,diglycol were added.

The fabric was printed, dried, aged 36 minutes above 212 F. in the usualmanner for printing vat colors on viscose rayon or cotton fabrics. Itwas rinsed minute in cold water and oxidized for 10 minutes with soap at140 F., then rinsed well and dried. A bright, well-defined orange printwas obtained on the blue ground.

Example 4 A 100% acetate knit jersey material was dyed 'a tomato redshade with 1% Eastone Red R in the customary manner, dried, printed, andas in Example 1. A clear, well-defined white was obtained on the redground.

Example 5 and-112% of Pontamine Fast Yellow 4GL (Pr. No.

53) and 0.2% Pontamine Fast Yellow RL based on the weight of the cotton.The customary sin- 'gle. bath method was employed in carrying out thedyeing operations. The dried fabric was block screen method using thefollowing printing paste:

Normal zinc formaldehyde sulfoxylate oz 12 Sodium formaldehydesulfoxylate oz 8 Thiodiglycol; oZ 8 Water qts 1 Supertex T-125 qts 2salicyclic acid -4 oz 4 After printing, the fabric was dried, aged above212 F. for 6 minutes, washed, and dried. A

'clear, sharp white discharge was obtained on the yellow material.

7 atoms.

salicyclic acid and prising a formaldehyde prising normal In the aboveexamples, salicylic acid can be replaced by its salts, such as itsammonium salt, its sodium salt, its potassium salt or its calcium salt,for example. In Example 3, the sodium salt of salicylic acid is formedowing to the presence of the alkali. r

Our invention is directed especially to fabrics comprising suchcellulose carboxylic esters as the hydrolyzed and unhydrolyzed celluloseacetates, cellulose propionates and cellulose butyrates, as well as themixed cellulose esters, such as the hydrolyzed and unhydrolyzed cellulose acetate-propionates and cellulose acetatebutyrates. All of thesecellulose carboxylic esters consist of a cellulose portion or radicaland an acid radical which contains from 2 to 4 carbon What we claim asour be secured by Letters Patent of the United States is:

1. A composition for discharge printing comprising a formaldehyde metalsulfoxylate and a substance selected from the group consisting ofsalicylic acid and its salts. I

2. A composition for discharge printing comprising formaldehyde sodiumsulfoxylate and a substance selected from the group consisting ofsalicylic acid and its salts.

3. A composition for discharge printing comprising a swelling agent forcellulose carboxylic ester textile materials, 3, formaldehyde metalsulfoxylate and a substance selected from the group consisting ofsalicyclic acid and its salts.

4. A composition for discharge printing comprising 2. formaldehydealkali metal sulfoxylate and salicyclic acid.

5. A composition for discharge printing comsalicylic acid.

'6. A composition for discharge printing comalkali metal sulfoxylate,normal zinc formaldehyde sulfoxylate and a substance selected from thegroup consisting of salicyclic acid and its salts.

7. A composition for discharge printing comprising formaldehyde sodiumsulfoxylate, normal zinc formaldehyde sulfoxylate and a substanceselected from the group consisting of salicylic acid and' its salts.

8. A process for discharge printing of textile materials comprising acellulose carboxylic ester comprising printing the textile materialcolored with a dischargeable dye with a paste comprising a formaldehydemetal sulfoxylate and a substance selected from the group consisting ofits salts, and steaming the printed fabric. p

91A composition for discharge printing comzinc formaldehyde sulfoxylateand a substance selected from the group consisting of salicyclic acidand its salts.

EDGAR C. JENSEN. HERBERTG. SCULL.

JAMES G. MCNALLY.

invention and desire to

